/**
* Get the article checkout URL.
*
* @param Article $article The article.
* @param Customer|null $customer The customer.
* @return string
*/
public function getArticleCheckoutURL(Article $article, Customer $customer = null)
{
if ($customer === null) {
return $article->getCheckoutUrl();
}
return $this->generateCheckoutURLForCustomer($customer->getHash(), $article->getArticleNumber());
}
